Iron-based multi-phase environmentally-friendly hydrogen storage material

ABSTRACT

The invention provides an iron-based multi-phase environmentally-friendly hydrogen storage material, which is prepared by the following method: the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; then the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum smelted to obtain the first TiVFe alloy ingots; then perform the first heat treatment for the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment.

TECHNICAL FIELD

This invention relates to the technical field of new energy materials, especially an iron-based multi-phase environmentally-friendly hydrogen storage material.

BACKGROUND TECHNOLOGY

Hydrogen storage materials play an increasingly important role in the field of high technology. The research funding for hydrogen storage in United States Department of Energy (DOE) accounts for about 50% of research funding for hydrogen energy, and have passed the “National Energy Policy Proposal” on Oct. 24, 1992; the Japanese government has formulated 1993-2020 “New Sunshine Plan”; China also attaches great importance to the research and development of hydrogen storage materials. In the national “863” plan and the “973” plan, hydrogen storage materials are regarded as one of the key research areas, which will give a great impetus to the development and utilization of new energy in the 21st century.

Many metals and alloys can react with hydrogen under certain conditions to form metal hydrides. However, as an excellent hydrogen storage material, it needs to meet some specific properties, including: large quantity of storage and release of hydrogen at a suitable temperature and pressure range; The formation enthalpy of hydrides is generally between −29 and −46 kJ·mol−1(H2). In the hydrogen storage application, the formation enthalpy should be smaller; in the heat storage application, the formation enthalpy should be larger; it should have a flat and wide balanced pressure platform area; and should have the appropriate equilibrium hydrogen pressure. In the hydrogen storage application, the decomposition pressure at the room temperature should be: 0.2-0.3 MPa; and should easy to be activated, should have good reaction kinetics and low hysteresis (Hysteresis refers to the phenomenon of equilibrium hydrogen pressure difference that occurs in the process of hydrogen absorption and desorption by metals or alloys); should have strong regenerative ability, that is: after repeated hydrogen absorption and hydrogen desorption cycles, its performance attenuation is small; should have good resistance to oxidation and corrosion; excellent effective thermal conductivity; abundant raw materials and low cost.

The information disclosed in this background technology section is only intended to provide an understanding of the general background of this invention, and should not be construed as acknowledging or implying in any way that the information composition is the existing technology known to the general technical personnel in the field.

SUMMARY OF THE INVENTION

The purpose of the invention is to provide an iron-based multi-phase environmentally-friendly hydrogen storage material, overcoming the shortcomings of existing technologies.

To achieve these objectives mentioned above, the present invention provides an iron-based multi-phase environmentally-friendly hydrogen storage material, characterized in that: an iron-based multi-phase environmentally-friendly hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce, and Gd metal raw material; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum smelted to obtain the first TiVFe alloy ingots; perform a first heat treatment on the first TiVFe alloy ingots; then perform a first rolling on the first TiVFe alloy ingots after the first heat treatment to obtain the second TiVFe alloy ingots; then perform a second heat treatment on the second TiVFe alloy ingots; after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment.

Preferably, in the technical scheme mentioned above, the preset chemical formula is: Ti_(a)V_(100-a-b-c-x-y)Fe_(b)Zr_(c)Gd_(x)Ce_(y), wherein a=9-10, b=10-12, c=2-3, x=0.5-1, y=1-1.3.

Preferably, in the technical scheme mentioned above, after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is less than 0.01 Pa, the melting time is 100-150 min, and during melting, the alloy ingots are flipped once every 200-300 s.

Preferably, in the technical scheme mentioned above, the first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 800-900° C., the heat treatment time is 10-12 h, and the heating rate is 50-60° C./min.

Preferably, in the technical scheme mentioned above, the first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 400-500° C., the rolling reduction is 40-45%, and the rolling speed is 0.3-0.4 m/s.

Preferably, in the technical scheme mentioned above, the second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 700-800° C., the heat treatment time is 5-6 h, and the heating rate is 50-60° C./min.

Preferably, in the technical scheme mentioned above, the second rolling performed on the second TiVFe alloy ingots after the second heat treatment is as follows specifically: the rolling temperature is 400-500° C., the rolling reduction is 50-55%, and the rolling speed is 0.7-0.9 m/s.

Preferably, in the technical scheme mentioned above, the third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 400-500° C., the heat treatment time is 15-20 h, and the heating rate is 50-60° C./min.

Compared with existing technology, the present invention has the following beneficial effects: according to the general requirements for hydrogen storage materials mentioned in the background technology, it is known that an excellent hydrogen storage material generally requires a material having good resistance to oxidation and corrosion, and a high effective thermal conductivity, abundant raw materials and low cost. One kind of hydrogen storage material that meets these requirements is TiVFe hydrogen storage material. Such alloys are chemically stable and have better corrosion resistance, more abundant sources of raw materials and lower costs than Mg-based hydrogen storage materials. However, the current TiVFe hydrogen storage materials still have the following problems: processing and molding is difficult; because this kind of alloys will form certain intermetallic compounds after smelting, resulting in high brittleness of the alloy, and fracture and internal micro cracks of alloy are likely to occur during machining process, which will result in a decrease in the hydrogen storage capacity of the alloy. In addition, this kind of alloy has a low hydrogen storage capacity. In order to solve the problems mentioned above, the present invention provides a machined iron-based multi-phase environmentally-friendly hydrogen storage materials, which is alternately processed by heat treatment and rolling. The present application is capable of rolling the alloy ingots to about 10% of the original size. Then, only the burrs around the alloy plates need to be removed, and the directly available alloy plates can be obtained. In this process, the number of internal cracks in the alloy is small, the alloy performance will not be affected greatly, which solves the difficulties in TiVFe alloy processing.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following implementations are provided in order to better illustrate this present invention, and to communicate the scope of the invention fully to the technical personnel in this field.

Implementation Example 1

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: Ti_(a)V_(100-a-b-c-x-y)Fe_(b)Zr_(c)Gd_(x)Ce_(y), wherein a=9, b=10, c=2, x=0.5, y=1. After weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is less than 0.01 Pa, the melting time is 100 min, and during melting, the alloy ingots are flipped once every 200. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 800° C., the heat treatment time is 10 h, and the heating rate is 50° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 400° C., the rolling reduction is 40%, and the rolling speed is 0.3 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 700° C., the heat treatment time is 5 h, and the heating rate is 50° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 400° C., the rolling reduction is 50%, and the rolling speed is 0.7 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 400° C., the heat treatment time is 15 h, and the heating rate is 50° C./min.

Implementation Example 2

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=10, b=12, c=3, x=1, y=1.3. After weighing, the Ti, V, Fe, Zr, Ce and G-d metal raw materials are vacuum-melted, specifically: the vacuum degree is less than 0.01 Pa, the melting time is 150 min, and during melting, the alloy ingots are flipped once every 200-300 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 900° C., the heat treatment time is 12 h, and the heating rate is 60° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 500° C., the rolling reduction is 45%, and the rolling speed is 0.4 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 800° C., the heat treatment time is 6 h, and the heating rate is 60° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 500° C., the rolling reduction is 55%, and the rolling speed is 0.9 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 500° C., the heat treatment time is 20 h, and the heating rate is 60° C./min.

Implementation Example 3

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=9.5, b=11, c=2.5, x=0.8, y=1.1. After weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is lower than 0.01 Pa, the melting time is 120 min, and during melting, the alloy ingots are flipped once every 250 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 850° C., the heat treatment time is 11 h, and the heating rate is 55° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 450° C., the rolling reduction is 42%, and the rolling speed is 0.35 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 750° C., the heat treatment time is 5.5 h, and the heating rate is 55° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 450° C., the rolling reduction is 52%, and the rolling speed is 0.8 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 450° C., the heat treatment time is 18 h, and the heating rate is 55° C./min.

Implementation Example 4

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=12, b=8, c=1, x=0.2, y=0.5. After weighing, the Ti, V, Fe, Zr, Ce and G-d metal raw materials are vacuum-melted, specifically: the vacuum degree is lower than 0.01 Pa, the melting time is 120 min, and during melting, the alloy ingots are flipped once every 250 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 850° C., the heat treatment time is 11 h, and the heating rate is 55° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 450° C., the rolling reduction is 42%, and the rolling speed is 0.35 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 750° C., the heat treatment time is 5.5 h, and the heating rate is 55° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 450° C., the rolling reduction is 52%, and the rolling speed is 0.8 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 450° C., the heat treatment time is 18 h, and the heating rate is 55° C./min.

Implementation Example 5

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=9.5, b=11, c=2.5, x=0.8, y=1.1. After weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is lower than 0.01 Pa, the melting time is 80 min, and during melting, the alloy ingots are flipped once every 200-300 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 1000° C., the heat treatment time is 8 h, and the heating rate is 40° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 300° C., the rolling reduction is 30%, and the rolling speed is 0.5 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 750° C., the heat treatment time is 5.5 h, and the heating rate is 55° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 450° C., the rolling reduction is 52%, and the rolling speed is 0.8 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 450° C., the heat treatment time is 18 h, and the heating rate is 55° C./min.

Implementation Example 6

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=9.5, b=11, c=2.5, x=0.8, y=1.1. After weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is lower than 0.01 Pa, the melting time is 120 min, and during melting, the alloy ingots are flipped once every 250 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 850° C., the heat treatment time is 11 h, and the heating rate is 55° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 450° C., the rolling reduction is 42%, and the rolling speed is 0.35 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 900° C., the heat treatment time is 8 h, and the heating rate is 80° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 600° C., the rolling reduction is 60%, and the rolling speed is 0.5 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 450° C., the heat treatment time is 18 h, and the heating rate is 55° C./min.

Implementation Example 7

The iron-based multi-phase environmental protection hydrogen storage material is prepared by the following method: provide Ti, V, Fe, Zr, Ce and Gd metal raw materials; the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are smelted in vacuum to obtain the first TiVFe alloy ingots; then perform the first heat treatment on the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. In this invention, the preset chemical formula is: TiaV100-a-b-c-x-yFebZrcGdxCey, wherein a=9.5, b=11, c=2.5, x=0.8, y=1.1. After weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is lower than 0.01 Pa, the melting time is 120 min, and during melting, the alloy ingots are flipped once every 250 s. The first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 850° C., the heat treatment time is 11 h, and the heating rate is 55° C./min. The first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 450° C., the rolling reduction is 42%, and the rolling speed is 0.35 m/s. The second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 750° C., the heat treatment time is 5.5 h, and the heating rate is 55° C./min. The second rolling performed on the second TiVFe alloy ingots after the second heat treatment is specific as follows: the rolling temperature is 450° C., the rolling reduction is 52%, and the rolling speed is 0.8 m/s. The third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 350° C., the heat treatment time is 30 h, and the heating rate is 40° C./min.

Implementation examples 1-7 were subjected to a hydrogen absorption mass percentage test and a fracture toughness property test in a manner well known in this field. The test results were normalized based on example 1, and the test results are shown in Table 1.

TABLE 1 hydrogen absorption fracture toughness mass percentage test property Implementation examples 1 100% 100% Implementation examples 2 100% 106% Implementation examples 3 105% 107% Implementation examples 4 58% 74% Implementation examples 5 72% 53% Implementation examples 6 70% 59% Implementation examples 7 78% 58%

The foregoing description of the specific exemplary embodiments of the present invention is for the purpose of illustration and exemplification. These description is not intended to limit the invention to the precise forms disclosed, and it is clear that many changes can be made according to the teachings mentioned above.

The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application so that technicians in the field can realize and utilize various exemplary embodiments of the invention, having various choices and changes. The scope of the invention is intended to be limited by claims and their equivalents. 

1. An iron-based multi-phase environmentally-friendly hydrogen storage material, characterized in that: the iron-based multi-phase environmentally-friendly hydrogen storage material is prepared by the following method: Provide Ti, V, Fe, Zr, Ce, and Gd metal raw materials; The Ti, V, Fe, Zr, Ce, and Gd metal materials are weighed according to a preset chemical formula; After weighing, the Ti, V, Fe, Zr, Ce, and Gd metal raw materials are vacuum smelted to obtain the first TiVFe alloy ingots; Perform a first heat treatment on the first TiVFe alloy ingots; Perform a first rolling on the first TiVFe alloy ingots after the first heat treatment to obtain the second TiVFe alloy ingots; Perform a second heat treatment on the second TiVFe alloy ingots; Perform a second rolling on the second TiVFe alloy ingots after the second heat treatment to obtain the third TiVFe alloy ingots; The third TiVFe alloy ingots is then subjected to a third heat treatment.
 2. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: in this patent, the preset chemical formula is: Ti_(a)V_(100-a-b-c-x-y)Fe_(b)Zr_(c)Gd_(x)Ce_(y), in this formula, a=9-10, b=10-12, c=2-3, x=0.5-1, y=1-1.3.
 3. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: after weighing, the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum-melted, specifically: the vacuum degree is less than 0.01 Pa, the melting time is 100-150 min, and during melting, the alloy ingots are flipped once every 200-300 s.
 4. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: the first heat treatment performed on the mentioned first TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 800-900° C., the heat treatment time is 10-12 h, and the heating rate is 50-60° C./min.
 5. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: the first rolling performed on the first TiVFe alloy ingots after the first heat treatment is as follows: the rolling temperature is 400-500° C., the rolling reduction is 40-45%, and the rolling speed is 0.3-0.4 m/s.
 6. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: the second heat treatment performed on the mentioned second TiVFe alloy ingots is as follows: the heat treatment pressure is lower than 0.01 Pa, the heat treatment temperature is 700-800° C., the heat treatment time is 5-6 h, and the heating rate is 50-60° C./min.
 7. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: the second rolling performed on the second TiVFe alloy ingots after the second heat treatment is as follows specifically: the rolling temperature is 400-500° C., the rolling reduction is 50-55%, and the rolling speed is 0.7-0.9 m/s.
 8. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1, characterized in that: the third heat treatment performed on the mentioned third TiVFe alloy ingots is specifically: the heat treatment atmosphere is hydrogen, the heat treatment temperature is 400-500° C., the heat treatment time is 15-20 h, and the heating rate is 50-60° C./min. 